My opinion - the BVI is not very good at enforcing rules in a meaningful but non-draconian way. Take a look at the fishing rules - violators can have their boats impounded? A bit heavy handed IMHO.

If it was me (and it's not) - I would fine them. But not force them to move. Forcing them to move would probably be unsafe and might penalize the wrong people (the boat owners). I would institute hours that you can use the moorings. Say 0600 to 1900. If you're on the mooring ball outside these hours it's a $500 fine. When you pick up your NPT permit this is explained to you just in case you can't read. Problem goes away in a few months and raises some money for the BVI treasury. And the moorings can be used for their intended purpose. That's what I would do if I ran the zoo.